**Core Concept**
Pregnancy-associated hypertension, also known as gestational hypertension or pre-eclampsia, is a condition characterized by new-onset hypertension and often proteinuria after 20 weeks of gestation. The management of this condition involves careful selection of antihypertensive agents that are safe for both the mother and the fetus.

**Why the Correct Answer is Right**
The primary goal of antihypertensive therapy in pregnancy is to control blood pressure while minimizing the risk of fetal harm. Certain classes of medications are contraindicated in pregnancy due to potential teratogenic effects. For instance, **ACE inhibitors** are known to cause fetal renal damage and are therefore avoided in pregnancy-associated hypertension.

**Why Each Wrong Option is Incorrect**
**Option B:**
* This option is incorrect because **beta blockers** are commonly used in pregnancy-associated hypertension to control blood pressure and prevent complications such as preterm labor and fetal growth restriction.

**Option C:**
* This option is incorrect because **calcium channel blockers** are also used in pregnancy-associated hypertension to control blood pressure and are generally considered safe.

**Clinical Pearl / High-Yield Fact**
When managing pregnancy-associated hypertension, it is essential to carefully weigh the benefits and risks of antihypertensive therapy, considering factors such as gestational age, fetal maturity, and potential teratogenic effects of the medication.

**Correct Answer:** A. ACE inhibitors are contraindicated in pregnancy-associated hypertension due to the risk of fetal renal damage.